Answer:
Correct option is
B
16dB
Sound level at A is ⊥o⊥B
If the intensity of sound at A 4 cm away from the source is I
A
then.
⊥o=10log
I
o
I
A
Where I
o
=10
−12
w m
−2
⇒⊥=log
10
−12
I
A
⇒
10
−12
I
A
=10
⇒I
A
=10
−11
wm
−2
If the source (s) is emmitting the sound energy of power P
I
A
=
4×(4)
2
P
⇒P=10
−11
×64π w
⇒ Intensity of sound (I
B
) ar point B,2 m
I
B
=
4π(2)
2
P
I
B
=
16π
64π×10
−11
10 m
−2
⇒I
B
=4×10
−11
wm
−2
⇒ Sound level at 2m=10log(
I
I
B )
=10log(10 −12
4×10 −11)
=10log40
=16.02
Hence Sound level at 2m from sourceis 16 dB
12. A measuring cylinder has 150ml. of water in it. When a stone is immersed into the measuring cylinder, the water level raised to 210cm. What is the volume of the stone?
Answer:
60ml
Explanation:
I'm going to assume you mean 210ml not centimeters. To find the volume all we do is subtract both values or with the formula [ f - i = v ] where f = final amount and i = initial amount.
210 - 150 = 60ml
Best of Luck!
The final level of water should be = 210
[tex] {cm}^{3} [/tex]
or 210 ml
━━━━━━━━━━━━━
Given:.Initial level of water = 150mlFinal level of water = 210 ml━━━━━━━━━━━━━
Need to find:Volume of stone =?━━━━━━━━━━━━━
Solution:The volume of stone will be equal to the change in level of water.
that's,
210 - 150 [tex] {cm}^{3} [/tex]
= 60[tex] {cm}^{3} [/tex]
Hence the volume of the stone is 60 [tex] {cm}^{3} [/tex]
Rearrange the equation below with the required unknown becoming the subject
a. V as subject
b. U as subject
c. a as subject
d. S as subject
Answer:
a.
[tex] {v}^{2} = {u}^{2} + 2as \\ v = \sqrt{ {u}^{2} + 2as} [/tex]
b.
[tex] {v}^{2} = {u}^{2} + 2as \\ {u}^{2} = {v}^{2} - 2as \\ u = \sqrt{ {v}^{2} - 2as} [/tex]
c.
[tex] {v}^{2} = {u}^{2} + 2as \\ 2as = {v}^{2} - {u}^{2} \\ a = \frac{ {v}^{2} - {u}^{2} }{2s} \\ \\ a = \frac{ {v}^{2} }{2s} - \frac{ {u}^{2} }{2s} [/tex]
d.
[tex] {v}^{2} = {u}^{2} + 2as \\ 2as = {v}^{2} - {u}^{2} \\ s= \frac{ {v}^{2} - {u}^{2} }{2a} \\ \\ s = \frac{ {v}^{2} }{2a} - \frac{ {u}^{2} }{2a} [/tex]
I hope I helped you^_^
PLS HELP PHYSICS
Use the list to answer the question.
potassium, Group 1
calcium, Group 2
iodine, Group 17
neon, Group 18
Which two elements in the list would bond together based on their ionic charges?
(1 point)
potassium and neon
potassium and iodine
calcium and neon
calcium and potassium
Answer:
It is Potassium and iodine
what are the major parts of the ear?
Explanation:
1.The parts of the ear include:
External or outer ear, consisting of: Pinna or auricle. This is the outside part of the ear. ...
2.Tympanic membrane (eardrum). The tympanic membrane divides the external ear from the middle ear.
3.Middle ear (tympanic cavity) , consisting of: Ossicles. ...
4.Inner ear , consisting of: Cochlea.
Explanation:
The major parts of ear are:-
1) Outer ear
PinnaExternal auditory canalTympanic membrane2) Middle ear
MalleusIncusStapes3) Inner ear
CochleaSemicircular canalsVestibuleeo *Write any two uses of good condutor of heat
any two uses of good conductor of heat are
aluminium, cooper, metal are good conductor of heat and they are used for making utensils.
gold, silver, are also good conductor of heat they are used for making jewelleries.
Activity log - Chest and Back Record your time and activity below and in your unit fitness log. If a particular category does not apply, leave it blank. Date: Warm-up: Cool-down: Type of Activity: (Cardiovascular, Muscular, or Flexibility) Description of Activity and Time: Intensity Level: (Moderate or Vigorous) Total Time:
Answer:
Muscular and vigorous
Explanation:
Big gains only
Answer:Date: 08/21/21
Warm-up: 5 minutes
Cool-down: 1 minute
Type of Activity: Muscular
Description of Activity and Time: push up, and repetitions 10 minutes
Intensity Level: Moderate
Total Time:16 minutes
Explanation:
what does the symbol 'Mg' represent?
Answer:
[tex]the \: symbol \: mg \: represent \: magnesium \\ thank \: you[/tex]
Answer:
Magnesium.
I hope it's helps you
What is the relationship between the number of resistors ,the effective resistance of the circuit and the total current in parallel
Answer:
As more and more resistors are added in parallel to a circuit, the equivalent resistance of the circuit decreases and the total current of the circuit increases. Adding more resistors in parallel is equivalent to providing more branches through which charge can flow.
state the factors that affect tha gravitational force
Explanation:
1. Mass of an object
2. Distance between the objects
Answer:
When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them.
Explanation:
PLEASE let me know you are satisfied with my answer or not☺☺
A ball rolled at a speed of 3m/s for 2.5s. How far did it travel?
Answer:
7.5 m
Explanation:
speed = distance/time
=> speed × time = distance
=> (3 m/s) × (2.5 s) = distance
=> 7.5 m = distance
4. A sprinter begins from rest and accelerates at the rate of 2 m/s2 for 200 m.
a) What is the sprinter's velocity at the end of the 200 m?
b) How long does it take him to cover it?
c) What is his average velocity?
Answer:
v=28.28m/s t=14.14s average velocity =2m/s
Explanation:
Starting at rest the initial velocity is 0 substituting that in the first equation of motion v=u+atgives the final velocity but we first have to determine the time using the third equation of motion which is s=ut+1/2at^2 and then do the substitution. Average velocity is the determined by adding the initial and final velocity then divide it by 2
una estación meteorológica informa que hay olas a lo largo de la costa con una separación de 8 segundos. por tanto, la frecuencia de ola es de...
Answer:
si
Explanation:
slove these question
Answer:
the answer would be left side a to right side b left side b to left side c left side c to left side d left side d to right side e
Explanation:
help with the number 2 question
Answer:
It is frequently stated that the value of the acceleration due to gravity at the pole is larger than at the equator because the poles are closer to the center of the earth due to the earth's oblateness. ... The measured value is larger because the earth's density is not uniform but increases toward the center.
Answer:
as explained that poles have more gravitational
force (9.83m/s^2) as the poles of earth is nearer to the center because it is flat at poles
but certainly at equator is having less gravitational force (9.78m/s^2) as it is Farr from centre of earth because it is bulgded at equator.
hence, poles have more gravitational force as co.pared to that of equator.
hope this helped you
any confusion the comment it.
If a diver displace water with a weight of 500N what is the upthrust on the diver?
Answer:
500 N
Explanation:
Natural bouyency will keep the diver in the same place, no matter what the mass of gfs. This means if the diver is displacing with a weight of 500 N, the upthrust will also be 500 N.
Upthrust on the diver will be 500 N
What is Upthrust?
It is the force exerted by a fluid on an object in upward direction .
Since , Upthrust = weight of the liquid displaced by a submerged part of the body
so, Upthrust = mg where m = mass of the body and
g = acceleration due to gravity
It is given weight of water displaced = 500 N
hence , Upthrust on the diver will be 500 N
Learn more about Upthrust :
https://brainly.com/question/22561277?referrer=searchResults
#SPJ2
plese help me if u know
Answer:
The velocity is uniform (unchanging) from A to B
The velocity increases from O to A
The velocity is decreasing from B to C and C to D
Acceleration is zero from A to B because the velocity is constant
The object starts to move at O and stops at D
A soccer ball is kicked horizontally. What is its average speed if its displacement is 21.0 m
after 2.00 s?
Answer:
Below
Explanation:
You can use this formula to find the average speed/velocity
speed = displacement / change in time
Plugging our values in....
speed = 21.0 m / 2.00 s
= 10.5 m/s
Hope this helps! Best of luck <3
The average speed of a soccer ball is 10.5 m/s.
What is speed?Speed is defined as the ratio of the distance moved by the object at a particular time. The unit of speed is measured in the meter per second, miles per hour, etc. The speed of an object is a scalar quantity and does not require any direction to represent it. It only requires magnitude to represent it.
Average velocity is defined as the sum of all the distances traveled by an object to the time taken by the object to cover the total distance.
Given that a soccer ball is kicked horizontally. its average speed if its displacement is 21.0 m after 2.00 seconds will be calculated as below:-
Speed = displacement / change in time
Speed = 21.0 m / 2.00 s
Speed = 10.5 m/s
Therefore, the average speed of a soccer ball is 10.5 m/s.
To know more about speed follow
https://brainly.com/question/4931057
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A small dog is 10 kg on the surface of the Earth. What is the
dog's weight, in N, on the moon?
Answer:
4 kg
Explanation:
because when you go the moon you lose 6 times your weight because of the gravitational pull
Answer:
16.3333333 newtons
Explanation:
on earth it would 98 newtons
what colors are included in our visible spectrum?
ALL colors are in the visible spectrum.
"Color" is a word we use to describe light that our eyes can detect. If the light has a "color", that means we can see it, and somebody gave it a name. If we can't see it, then we don't have a "color" to describe it.
Every color that has ever been perceived by human eyes is present in the humanly-visible spectrum, except "black".
There are at least hundreds of them. Probably thousands. Maybe millions.
The Colours that are included in visible spectrum are - 7 Colours namely :
Red Orange yellowgreen blueindigovioletExplanation:
when white light passes through a prism , the violet light bends most and the red light bends the least.Dispersion of light is the phenomenon of splitting of white light into its constituent seven colours on passing through a glass prism.The band of seven Colours so obtained is called visible spectrum.The seven Colours of white light are Violet, indigo , blue, green , yellow, orange and red . It is remembered by the acronym - VIBGYOR.
Is the earth flat or round or a donut?
A glacier advances at 8 x 10-6 cm/s.
How far will it move in 6.6 y?
Answer in units of cm
Explanation of the Lunar eclipse
● Provide details such as rotation and axis.
● For lunar and solar eclipse describe partial eclipse
and total eclipse. For seasons describe all four seasons.
● Identify the relative position of the sun and earth in each case.
● Use a cause and effect to show how the chosen phenomena
occurs.
A lunar eclipse occurs when the Moon moves into the Earth's shadow. This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned (in syzygy) with Earth between the other two, and only on the night of a full moon.
A STONE IS THROWN VERTICALLY UPWARD WITH THE VELOCITY 25/s HOW LONG DOES IT TAKES TO REACH THE MAXIMUM HEIGHT?
Answer:
time taken to reach maximum height is 2.548 sec and Maximum height is 31.855 m
Explanation:
Initial velocity U= 25 m/s
at maximum height velocity, V= 0 m/s
Let the time taken to reach maximum height be t and maximum height be H.
V= U-gt
so 25-9.81.t=0
therefore t= 25/9.81 = 2.548 sec
Now,
H= Ut-1/2(gt^2)
=25x2.548-0.5x9.81x(2.548^2)
=31.855 m
Thank you
true or false
the bounciness of a ball changes with temperature
true
false
Answer:
False
Explanation:
This depends on how much air is in the ball, I think
what is displacement
Answer:
finding the volume of an irregular shape
Any two waves that meet as they travel through the same medium will interact. If the two waves are in phase their crests will coincide and they will experience _____ interference, producing a wave with a(n) _____ amplitude.
Answer:
constructive
alpitude
How far would a snowmobile travel in 0.5 hours at a rate of 25 km/h?
Answer:12.5 km
Explanation:
0.5=1/2
25 x 1/2 = 12.5 (25 ÷ 2 = 12.5)
Answer:
12.5 km
Explanation:
Distance = Speed x Time
= 25 x 0.5
= 12.5 km
Round 0.010229 to four sig figs
It would be 0.01023.
0.010229 has 5 sig. fig.'s (leading zeros do not count)
So rounding to 4 sig. fig.'s is just a matter of rounding off the last digit, which leaves you with 0.01023.
Which elements are in the same column (above or beneath) oxygen?
Answer:
Bismuth And Nitrogen
Explanation:
Because they have the same number of Valence Electrons
Answer:
There is nothing above oxygen but beneath there is sulfur as shown in the figure.
if rechargeable cell is being charged from a source of EMF the EMF of cell during charging is
A. always equal to its terminal potential difference
B. always greater than its terminal potential difference
C. always less than its terminal potential difference
D. either equal or less than its terminal potential difference
Answer:
a
Explanation:
I think bec. I am in small school